Heat oven to 400 degree. Grease pie plate. 10 X 1 1/2 inches. Brown beef and onion; drain. Stir in salt and pepper. Spread in plate. Beat milk, baking mix and eggs until smooth, 15 seconds in blender or high or 1 minute with hand beater. Pour into plate. Bake 25 minutes. Top with tomatoes, sprinkle with cheese. Bake until knife inserted in center comes out clean, 5 to 6 minutes. Cool 5 minutes.
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